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There are 15 points in a plane , no three of which are in the same straight line with exception of 6, which are in the same straight line. Find the number of .a) straight lines formed by) number of triangles formed by joining these points. |
| Answer» There are 15 points in a plane , no three of which are in the same straight line with exception of 6, which are in the same straight line. Find the number of .a) straight lines formed by) number of triangles formed by joining these points. | |